P.O. Box 555   Simi Valley,   California   93062-0555
  Phone: 1-805-527-1622

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Definitions

H.E.P.A.

High Efficiency Particulate Air, throw away media dry type filter in a rigid frame having a minimum particle efficiency of 99.97% for 0.3 micron particles.
 

CFM Cubic foot per minute, volume flow rate.
 
FPM Feet per minute, air velocity. (distance traveled per unit of time is usually expressed in feet per minute)
 
BTU

British thermal unit

  1. The quantity of heat required to raise the temperature of one pound of water from 60 to 61F at a constant pressure of one atmosphere.
     

  2. The quantity of heat equal to 1/180 of the heat required to raise the temperature of one pound of water from 32 to 212F at a constant pressure of one atmosphere.

Riser

A framing structure used to increase the work surface height of a standard Horizontal Laminar Flow from 32.75 to 36.75, 38.75 or 40.75 inches. Unit can be added on to existing units in the field.
 

Magnehelic

Instrument used to monitor pressure within the plenum chamber of the H.E.P.A. filter module. Increased static pressure indicates the need to adjust the air flow of the work station or when this is no longer possible replace the H.E.P.A. filter assembly.
 

Germicidal lamp

The Germicidal bulb is a special glass that transmits ultraviolet radiation of 253.7 nanometer wavelength generated by the arc. Radiation of this wavelength kills a wide variety of bacteria and molds.
 

Diopter

Term used to identify the amount of power in a lens. Each diopter increases magnification by approximately 25%.
 

   
   

 

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Last modified: July 21, 2016